# Fact Verification MCP [Health: Active]

**Category:** 💻 Developer Tools  
**Repository:** https://github.com/FoundryNet/fact-check-mcp  
**GitHub Stars:** 0  
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**Installs:** 0  
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**Directory Page:** https://allmcps.com/mcp/fact-verification-mcp

## Description
Verify claims with verdict, confidence & cited sources; batch verify, source checks, daily brief.

## Tools
Capabilities this server exposes over MCP:

- **verify_claim** — Verify a claim → verdict, confidence, cited sources, explanation
- **batch_verify** — Verify many claims in one call
- **source_check** — Assess a source URL — domain age (RDAP), trust signals, bias indicators
- **daily_brief** — Curated daily brief — top disputed/most-verified claims, trending topics
- **brief_summary** — Structured top-5 signals from today's brief — a cheap sample of `daily_brief
- **mint_info** — FoundryNet Data Network attestation info

## Claude Desktop Quick Installation
Remote MCP endpoint (confidence: high). Install path detected from listing signals. Add as a URL/SSE server in your client:

```json
"mcpServers": {
  "fact-verification-mcp": {
    "url": "https://fact-check-mcp-production.up.railway.app/mcp"
  }
}
```

## Documentation & README

# Fact Verification MCP

**Fact verification for AI agents** — give it a claim, get a **verdict**
(`supported` / `disputed` / `unverifiable`) with a **0-100 confidence** and **cited
sources**. It classifies each claim's domain and cross-references the FoundryNet
Data Network plus a general web search.

> Part of the **FoundryNet Data Network**. Verification results carry a verifiable
> provenance attestation. See also:
> **financial-signals-mcp**, **cyber-intel-mcp**, **patent-intel-mcp**,
> **gov-contracts-mcp**, **compliance-mcp**, **brand-intel-mcp**,
> **weather-intel-mcp**, **academic-intel-mcp**, **oss-intel-mcp**,
> **social-intel-mcp**.

## Connect

- **MCP endpoint** (Streamable HTTP): `https://fact-check-mcp-production.up.railway.app/mcp`
- **Registry:** `io.github.FoundryNet/fact-check-mcp`
- **Agent card:** `https://fact-check-mcp-production.up.railway.app/.well-known/agent-card.json`

### Claude Desktop / Cursor / Claude Code

```bash
claude mcp add --transport http fact-check https://fact-check-mcp-production.up.railway.app/mcp
```

```json
{ "mcpServers": { "fact-check": { "url": "https://fact-check-mcp-production.up.railway.app/mcp" } } }
```

## Tools

| Tool | Price | What it does |
|---|---|---|
| `verify_claim` | $0.02 | Verify a claim → verdict, confidence, cited sources, explanation |
| `batch_verify` | $0.01/claim (min $0.05) | Verify many claims in one call |
| `source_check` | $0.01 | Assess a source URL — domain age (RDAP), trust signals, bias indicators |
| `daily_brief` | $5 | Curated daily brief — top disputed/most-verified claims, trending topics |
| `brief_summary` | $0.50 | Structured top-5 signals from today's brief — a cheap sample of `daily_brief` |
| `mint_info` | **free** | FoundryNet Data Network attestation info |

**Free tier:** 10 verifications/day per agent. Then metered: the tool returns an
HTTP-402 payment challenge — pay it, re-call with the same args plus
`payment_tx=<signature>`. An `Authorization: Bearer fnet_…` key bypasses the paywall.

## How it works

Each claim is classified by domain and cross-referenced against the most relevant
FoundryNet data source **and** a general web search:

- **company** claims → `brand-intel-mcp`
- **finance** claims → `financial-signals-mcp`
- **patents** claims → `patent-intel-mcp`
- **regulation** claims → `compliance-mcp`

The verdict is synthesized from source agreement and returned with the citations
that drove it. Results are **cached for 24h** (keyed by a normalized-claim hash) and
carry a **verifiable provenance attestation** so a buyer can verify the result was
produced by this server, unaltered.

> The general web-search backend needs a `WEB_SEARCH_API_KEY` (Brave Search API).
> Without it, claims with no FoundryNet corroboration return `unverifiable` with a
> note rather than a guess.

## Sources

On demand: a general **web search** (Brave Search API) + the **FoundryNet Data
Network** sibling servers (called over their public MCP endpoints). Source-credibility
checks use keyless **RDAP** for domain age. Cached in a standalone Supabase project.

## Discovery

MCP registry: `io.github.FoundryNet/fact-check-mcp`

Built by [FoundryNet](https://foundrynet.io?utm_source=github&utm_medium=readme&utm_campaign=fact-check-mcp) · forge@foundrynet.io

## Live network activity

Real-time verified work across 17 servers and autonomous agents. See [foundrynet.io](https://foundrynet.io?utm_source=github&utm_medium=readme&utm_campaign=fact-check-mcp).